666731602 has 8 divisors (see below), whose sum is σ = 1058926716. Its totient is φ = 313756032.

The previous prime is 666731599. The next prime is 666731617. The reversal of 666731602 is 206137666.

666731602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 659924721 + 6806881 = 25689^2 + 2609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9804843 + ... + 9804910.

Almost surely, 2^666731602 is an apocalyptic number.

666731602 is a deficient number, since it is larger than the sum of its proper divisors (392195114).

666731602 is a wasteful number, since it uses less digits than its factorization.

666731602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19609772.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 666731602 is about 25821.1464114202. The cubic root of 666731602 is about 873.6088269348.

The spelling of 666731602 in words is "six hundred sixty-six million, seven hundred thirty-one thousand, six hundred two".